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There are several ways to connect to database systems such as MySQL, PostgreSQL, Oracle, SQLite, and Microsoft SQL Server from Ruby. Typically, a driver library is available for each of the main database systems, although these don t come with Ruby by default. You typically install database driver libraries using the RubyGems Ruby library packaging system, or you might need to download and install them manually. Explaining how to use such libraries is beyond the scope of this appendix, but they are covered in full in 9. Ruby also has a DBI library that can provide a more standardized interface to all the various driver libraries. Because each driver library is mostly based on the official library for each database system, they re extremely inconsistent and differ in their implementation. DBI makes many of the features provided by these drivers available in a consistent manner.

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Note Ruby s DBI library is not exactly like Perl s DBI library, but is heavily influenced by it, and Perl

IN THIS CHAPTER, YOU WILL:

have root access, you should compile Python yourself, as described in the section Compiling from Sources, later in this chapter.

Ruby comes with libraries that make accessing data on the Web incredibly easy. At a high level is the open-uri library, which makes it easy to access data from the Web. This example retrieves a Web page and returns an array containing all the lines on that page:

open-uri is a convenience library that provides an open method that allows you to load data from URLs. open returns a File handle (technically a Tempfile object) that works in the same way as any other File object, allowing you to use methods such as readlines to read all the lines of the data into an array. (This topic is covered in significantly more depth in 14.) Ruby also provides lower-level libraries, such as net/http. Here s an example of retrieving a file from a Web site and displaying it on the screen:

WHEN YOU complete the Beyond Bullet Points (BBP) Story Template, you have in hand a complete and coherent story that sets the foundation for all of your slides. Your story is so clear that even if your technology fails during your presentation, you have the security of knowing that you can present using only a printout of the story template as your guide. But of course you ll want to use graphics in your Microsoft Of ce PowerPoint 2007 presentation, because research indicates that people learn better when you add graphics to your narration in a multimedia presentation.

require 'net/http' Net::HTTP.start('www.rubyinside.com') do |http| req = Net::HTTP::Get.new('/test.txt') puts http.request(req).body end

There are several other package systems and installation mechanisms for Linux than rpm. If you re running a Linux system with some form of package manager, chances are you can get Python through it.

Hello Beginning Ruby reader!

Transform your script into a storyboard with preliminary backgrounds. Write out the words you ll speak during the presentation. Review the three ground rules for storyboarding.

This example connects to the Web server at www.rubyinside.com and performs an HTTP GET request for /test.txt. This file s contents are then returned and displayed. The equivalent URL for this request is http://www.rubyinside.com/test.txt, and if you load that URL in your Web browser, you ll get the same response as this Ruby program. net/http also lets you make requests using other HTTP verbs such as POST and DELETE, and is the most flexible HTTP library for Ruby. As it s included with the standard library, it s usually the first choice for most Ruby developers. Refer to 14 for full information.

This section looks at how you can organize code into multiple files and manage libraries within Ruby.